Terahertz saturable absorbers exploiting intersubband polaritons

Leonardo Viti,Francesco P. Mezzapesa,Jürgen Raab,Liahne Li,Giles A. Davies,Edmund H. Linfield,Christoph Lange,Rupert Huber,Miriam S. Vitiello

Novel In-Plane Semiconductor Lasers XX（2021）

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摘要

We devise a THz polaritonic saturable absorber exploiting ultra-strong coupled intersubband cavity polaritons generated in a multi quantum well (MQW) heterostructure. By coupling the polaritonic saturable absorber reflector with a high bandwidth heterogeneous THz QCL frequency comb (2.3-3.8 THz) we demonstrate spectral reshaping of the QCL emission and a major increase of the comb operational dynamic range up to 38% characterized by a stable single and narrow intermode beatnote.

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关键词

Saturable absorption,Quantum cascade laser,Frequency comb,Polariton,Terahertz radiation,Quantum well,Optoelectronics,Heterojunction,Reflector (antenna),Materials science

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